S
M
T
W
T
F
S
26
66°
41°
27
70°
51°
28
63°
49°
29
59°
35°
30
59°
33°
1
51°
32°
2
58°
28°
3
70°
41°
4
81°
42°
5
57°
43°
6
58°
32°
7
63°
28°
8
71°
38°
9
75°
42°
10
67°
37°
11
62°
37°
12
73°
49°
13
65°
39°
14
69°
52°
15
79°
56°
16
78°
59°
17
82°
66°
18
80°
61°
19
72°
52°
20
68°
51°
21
72°
53°
22
76°
56°
23
77°
58°
24
76°
56°
25
74°
53°
26
79°
60°
27
79°
60°
28
78°
59°
29
79°
60°
30
77°
59°
31
73°
55°
1
71°
54°
2
70°
60°
3
77°
61°
4
79°
61°
5
78°
60°
6
77°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Oswego
Oswego's May 2026 forecast shows daily high temperatures ranging from 65° to 82°, with overnight lows between 39° and 66°. The average high for May is 75° with an average low of 56°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Oswego. See also: June | July | August.
